Assifinqftrto himself



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JAMES S. GRAHAM, or ROCHESTER, NEW YORK,.ASSteNoRePoAHiMSELE l. AND o. R. TOMPKINS, or THE SAME PLAGE.

Letters Patent N'o. 64,308, dated April 30, 186i?.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, JAMES S. GRAHAM, of Rochester, in the county of Monroe, and State ot New York, haveV invented certain' new and useful improvements in the construction 0f the Cutter-Heads for Tenoning Maehinesg and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, making part of this Specification, in which- Figure 1 is a top view of the head H, showing the curved shape of the bed to which the knives k are bolted.

Figure 2 is a similar view of the head, hut turned so as to'show the back of one knife and its curved edge.

Figure 3 is a transverse section of the same, taken in t-he plane of the red line n in gs. 1 and 2.

Like letters indicate like parts. i I

The ordinary cutter-heads of tenonin'g machines, in order to effect a'shearing Stroke or out, have the knives attached to an oblique bed, or on an angle to the axis of the head, and consequently when a tenen of four inches or more in lengt-h is to be out, there must be two or more knives attached t0 the same side ofthe cutter-head.

The object of this invention'is to accomplish the same result with a knife reaching :the whole'length of the tenon; and it consists in providing a circular bed for the knives of the cutter-heads offthis classiof machines, and making the knives with curved edges. whereby a shearing cut is eecteth'and one knife is made to cu't the whole length of the tenori.

To enable others to make and use my invention, I will describe-its construction and operation.

I construct the head, H, in the usual Skeleton form, but I curve the knife-bed or seat, a, on the wings w, longitudinally, about as Shown in fig. 1. I then curve the knives lc. to nearly t thiscuive, leaving them atrile straightcr than the curve of` the bed. The-knives are then firmly secure-:itc the head by the screw-bolt b. The

curve of the edge of the bits or knives is nearly formed in the rough before being attached to the head. The,

head is then put in the lathe and the edge of the knives turned of? lso as to constitute a perfectly eylindricai mittel', every point on vthe edge being e'quidistant from the centre of the heh-d, after which the desired bevel is ground on. By means` of this curve in the cutting edge of the knives k, a shearing stroke or cut is produced upon the stieksvliiclilis being tenoned. A similar effect might be producedby making straight bevels from the vcentre of the beds a each Way toward the ends ot' the head. This would require the edge of the knives to bc straight from the centre angle to the ends. It will be seen, also, that the bed a for the knives may, whether curved or V-shaped, be reversed and made higher at thev ends, which would make the leading point in the cutting edge of thekni'ves in the centre. I use the ordinary spurs, s, either with a serrated edge or a Heam point, as may be desired.

That I claim as any invention, and desire to secure by Letters Patent, '1s- The arrangement of the knives or cutters k, constructed substantially as shown and described, upon the longitudinnlly-ourved hed of the head H of tenoning machines, for the-.purposes herein set forth.

'i JAMES GRAHAM.

Witnesses:

WM. S. LouefnBoRoUeH, y

P. '.l. TURNER. f 

